氢自养反硝化技术去除饮用水中高浓度的硝酸盐

Hydrogenotrophic Denitrification for Removal of High Concentration Nitrate from Drinking Water

考察了附着生长型氢自养反硝化反应器对饮用水中高浓度硝酸盐的去除能力,探讨了溶解氢气(DH)浓度对反硝化效果的影响。结果表明,对硝酸盐的去除效果稳定,平均出水浓度为1.49 mg/L,去除率为95.4%;在出水中检测到了亚硝酸盐,平均浓度为5.39 mg/L,且波动较大,导致对总氮的去除率仅为80.6%。亚硝酸盐可通过次氯酸钠快速氧化去除,计量关系为有效氯∶亚硝酸盐=4.96∶1。硝酸盐的去除几乎不受DH浓度的影响,但总氮的去除却受其影响很大,DH浓度的变化导致出水总氮值波动较大。填料堵塞是该反应器存在的主要问题,建议通过加强反冲洗来解决。

The capability of a hydrogenotrophic denitrification reactor operated in the attached growth system for removal of high concentration nitrate from drinking water was investigated, and the influence of dissolved hydrogen （DH） on denitrification was discussed. The results show that nitrate is removed stably with an average effluent concentration of 1.49 mg/L and a removal rate of 95.4% , while nitrite is detected in the effluent with an average of 5.39 mg/L and a high fluctuation, leading to TN removal rate of 80.6%. Nitrite can be rapidly removed by sodium hypochlorite oxidizing, with the stoichiometric relationship between available chlorine and nitrite of 4.96 ： 1. Nitrate removal is hardly influenced by DH concentration, while TN removal is significantly influenced by DH concentration. The variation of DH causes remarkable fluctuation of effluent TN. Clogging is the main problem of the reactor, which can be solved by backwashing.